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Changing the teflon coupler?

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Hi guys, I blew the dust off the UM2 to do some prints last week, and have been having nothing but failed prints, all due to under extrusion.

I have some spare couplers, so might as well change it out, but before I do, are there any instructuions on how to do it? I've never pulled the nozzle apart before.

I did do a search, but it's didnt give me a specific topic on the subject.



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question 1, is it time to get a replacement teflon coupler?

question 2, when was the new coupler material introduced?


Q1 it probably is worth looking at it to check for wear and deformation, my last one lasted about 600 hours, but it depends on what print material you have been using. Higher temp material seems to cause more wear

Q2 new teflon coupler was introduced last spring (April/May) last year

I would also recommend its time for lubrication of all the rods too, I use thin oil on a cloth for the rods and grease for the Z axis


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